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HC05 Datasheet(PDF) 121 Page - Motorola, Inc |
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HC05 Datasheet(HTML) 121 Page - Motorola, Inc |
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121 / 232 page  MC68HC05X16 Rev. 1 MOTOROLA 7-19 SERIAL COMMUNICATIONS INTERFACE 7 SCR2, SCR1, SCR0 — SCI rate select bits (receiver) These three read/write bits select the baud rates for the receiver. The prescaler output described above is divided by the factors shown in Table 7-5. The following equations are used to calculate the receiver and transmitter baud rates: where: NP = prescaler divide ratio NT = transmitter baud rate divide ratio NR = receiver baud rate divide ratio baudTx = transmitter baud rate baudRx = receiver baud rate fCLK = CPU clock frequency Table 7-5 Second prescaler stage (receiver) SCR2 SCR1 SCR0 Receiver division ratio (NR) 000 1 001 2 010 4 011 8 100 16 101 32 110 64 111 128 baudTx f clk 16 NP NR • • ----------------------------------- = baudRx f clk 16 NP NR •• ----------------------------------- = 119 |
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